z^2-4z=-2

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Solution for z^2-4z=-2 equation:


Simplifying
z2 + -4z = -2

Reorder the terms:
-4z + z2 = -2

Solving
-4z + z2 = -2

Solving for variable 'z'.

Reorder the terms:
2 + -4z + z2 = -2 + 2

Combine like terms: -2 + 2 = 0
2 + -4z + z2 = 0

Begin completing the square.

Move the constant term to the right:

Add '-2' to each side of the equation.
2 + -4z + -2 + z2 = 0 + -2

Reorder the terms:
2 + -2 + -4z + z2 = 0 + -2

Combine like terms: 2 + -2 = 0
0 + -4z + z2 = 0 + -2
-4z + z2 = 0 + -2

Combine like terms: 0 + -2 = -2
-4z + z2 = -2

The z term is -4z.  Take half its coefficient (-2).
Square it (4) and add it to both sides.

Add '4' to each side of the equation.
-4z + 4 + z2 = -2 + 4

Reorder the terms:
4 + -4z + z2 = -2 + 4

Combine like terms: -2 + 4 = 2
4 + -4z + z2 = 2

Factor a perfect square on the left side:
(z + -2)(z + -2) = 2

Calculate the square root of the right side: 1.414213562

Break this problem into two subproblems by setting 
(z + -2) equal to 1.414213562 and -1.414213562.

Subproblem 1

z + -2 = 1.414213562 Simplifying z + -2 = 1.414213562 Reorder the terms: -2 + z = 1.414213562 Solving -2 + z = 1.414213562 Solving for variable 'z'. Move all terms containing z to the left, all other terms to the right. Add '2' to each side of the equation. -2 + 2 + z = 1.414213562 + 2 Combine like terms: -2 + 2 = 0 0 + z = 1.414213562 + 2 z = 1.414213562 + 2 Combine like terms: 1.414213562 + 2 = 3.414213562 z = 3.414213562 Simplifying z = 3.414213562

Subproblem 2

z + -2 = -1.414213562 Simplifying z + -2 = -1.414213562 Reorder the terms: -2 + z = -1.414213562 Solving -2 + z = -1.414213562 Solving for variable 'z'. Move all terms containing z to the left, all other terms to the right. Add '2' to each side of the equation. -2 + 2 + z = -1.414213562 + 2 Combine like terms: -2 + 2 = 0 0 + z = -1.414213562 + 2 z = -1.414213562 + 2 Combine like terms: -1.414213562 + 2 = 0.585786438 z = 0.585786438 Simplifying z = 0.585786438

Solution

The solution to the problem is based on the solutions from the subproblems. z = {3.414213562, 0.585786438}

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